Combination hoisting and lifting jack



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April 3U, l935 y c. H. JACKSON 1,999,174

COMBINATION HOISTING AND LIFTINGl JACK Filed Sept. l1, 1933 2 Sheets-Sheet 2 Bymm /l Home y Patented Apr. 30, 1935 COMBINATION nots JA TING AND LIFTING 1 Claim.

This invention relates to an improved jack which is especially constructed to serve primarily for hoisting embedded rods and pipes such as well pipes and further constructed to permit it to be utilized as an ordinary jack for lifting weighty objects Yandthe like.

One feature of the improved jack is predicated upon the base formation of the standard which is particularly adapted to rest firmly and adelO quately on a seating board or the like, the base formation being fashioned to provide a pair of stabilizing feet to straddle the pipes of the string of piping such as are used in driven water wells and the like.

A further feature of construction is predicated upon the adoption and use of a lifting and lowering feed screw whose upper end is fashioned with a disk-like load rest or head and whose lower end is attached to a hoisting claw slidably mounted in a slotted portion of the hollow standard.

An especially designed well-balanced feed screw actuating nut is also adopted and utilized as an added feature of the invention.

Last, but not least, I desire to emphasize the provision of a dependable, quick-acting pipe clamp expressly made for expeditious application and removal and appropriately designed to accommodate the stress and strain to which it is subjected when used in conjunction with the hoisting claw of the jack.

Other features and advantages may become apparent from the following description and drawings.

In the drawings:

Figure 1 is an elevational view of the complete assembly showing the manner in which it is utilized for extracting a driven well pipe or casing.

Figure 2 is a view in section and elevation, detailing the specific jack construction.

Figures 3 and 4 are horizontal sectional views taken on the planes of the lines 3-3 and 1 -li respectively of Figure 1.

Figure 5 is a perspective view of the special feed screw actuating nut.

Figures 6 and 7 are elevational views of opposite sides of the especially designed pipe clamp.

Figure 8 is a section taken approximately on the plane of the line 8-8 of Figure '7, the view being somewhat enlarged to disclose the anti- 50 slipping teeth.

In Figure l the reference character G designates the ground and P a wooden platform which is placed on the ground in the vicinity of the well to provide an effective support for the hoisting 55 assembly. The letter A designates the well pipe.

(Cl. 25d-$8) Considering now the S '@A'EENT QFFIQE particular construction of the jack, it will be observed that it comprises a single cast standard 9 having a central perpendicular bore It and provided at its upper end with a flat top weight supporting and bearing forming head l i. As before implied, the base portion i2 is somewhat enlarged to seat effectively on the platform P and is provided with a pair of outstanding stabilizing and balancing feet I3 which straddle the pip Figure l. The numera e in the manner shown in l ifi designates a vertically elongated slot in communication with the bore iii adapted to accommcda ing unit l5.

te the reciprocatory hoist- This is of general block-like form and provided with claws i5 to slidably embrace the pipe A. At its inner end this unit is xedly attached as indicated at il to the lower reduced end of the feed screw i8. The feed screw works up and down through a guide passage i9 formed in the head and registering with the bore l0. 1t is understood that the feed screw does not rotate since it is rigidly connected at its lower end as at i? with the block like unit and the block like unit moves up and down in the slot I4.

The numeral 2i! designates the actuating nut which is shown as provi ded with a reduced adapter neck or sleeve provided with seats or depressions 2l permitting said part to serve as a rotary ratchet. The ratchet rests rotatably on the head li and the feed screw extends up through and beyond the nut and terminates in a load-supporting disk-like head 22. The ratchet is surrounded by a ring-like collar 23 provided with a socket 2li to accommodate an operating rod or handle 2t. The numeral 2t in Figure 3 merely designates a spring-pressed reversible pawi carried by the collar and selectively engageable with the ratchet member 2l.

I next call attention to the numeral 21 which designates an especially designed pipe clamp.

This comprises a pair companion sections 2 of substantially duplicate 8 and 29 hingedly connected together at corresponding ends as indicated at SD. The intermediate portions are of semi-circular form as indicated at 3! and cooperate in forming a pipe grip. The inner faces thereof are provided with anti-slipping teeth 32 as indicated in Figure respective sections are 8. The terminals of the differentiated by the numerals 33 and 34, the end 33 being somewhat shorter` than the extended end portion 34. Both of these end portions 33 and 3ft are, however,

formed with registering notches 35 defining a keeper seat for the clamping bolt 36.

is provided at one en The bolt 36 d with a winged grip 31.

The opposite end thereof is attached to a nut 38 as indicated in Figure 7 formed on one end of a retaining link 39 pivotally attached as at 40 to the extended end portion 34. This arrangement allows the clamping bolt 36 to be inserted and withdrawn from the notches 35 expeditiously and conveniently. It also makes for a quickacting pipe clamp. Then too, the particular construction of the hinged parts 28 and 29, together with their end extensions 33 and 34 provide diametrically opposite abutments with which the aforesaid claws I 6 engage as indicated in Figure l to provide the requisite lifting force.

I have yet to mention that the numeral 4l merely designates a handle on the standard of the jack and the numerals 42 in Figure 5 designate a multiplicity of sockets formed in the nut to accommodate removable rods (not shown) which may be used to turn the nut in case the handle 25 breaks.

The method of operation and use of the clamp and jack assembly is quite clear from the drawings and a description thereof is thought to be unnecessary.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes in shape, size, and rearrangment 0f details coming Within claimed may be resorted to in actual practice. if desired.

What is claimed is:

In a jack of the class described including a hollow standard and a vertically arranged screw shaft having its lower portion loosely arranged in said standard', a block-like member having a vertically arranged threaded bore through which the shaft passes, the lower end of said block-like member being reduced and of circular shape in cross section with its lower end resting on the top of the standard, said reduced portion having vertically arranged notches in its circumference, the ends of which terminate short of the ends of said reduced portion, a handle member having a ring-shaped part encircling the reduced part and covering the notches and having its lower edge resting on the top of the standard and a the field of invention spring-pressed dog carried by the ring-shaped part for engaging the notches.

CHARLES HENRY JACKSON. 

